Software firewalls, installed on individual devices like computers and smartphones, provide precise control over network traffic. They function by permitting or denying access for specific applications or features on that device. This fine-tuned control safeguards the device against unauthorized access and threats while ensuring the passage of legitimate traffic. Conversely, hardware firewalls are physical appliances that secure an entire network. Antivirus software is designed for the identification and elimination of malicious software, whereas malware is the term for such harmful software.